Western silver heiress Val DeVere expects nothing but joy at an elegant Newport picnic in 1899, only to be abruptly summoned to New York by a close friend's urgent and cryptic plea: "PLEASE HELP...THEO B."

In New York, Theo confides in Val, begging her to save his lively cousin Phoebe from a cunning Irish manservant who, he claims, is plotting her "accidental" death in the Rocky Mountains-just as he allegedly orchestrated the death of her twin sister in Boston a year earlier.

Determined to help her friend, Val, now Mrs. Roderick DeVere, tries to convince the headstrong Phoebe to delay her trip to the Rockies. Yet the Irish servant, whom Theo accuses of murder, reminds Val of her beloved late father, an Irish immigrant and "Silver King," whose charm and brogue are unsettlingly familiar.

When Phoebe is found murdered in her New York apartment, suspicion falls squarely on the Irishman, appearing to wrap the case up neatly. But for Val, the truth feels far more elusive. Is she blinded by sentiment, or is there another killer lurking in the shadows? As doubt creeps in, Val faces a race against time to uncover the real culprit, all while risking arrest as an accessory to murder.